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'Onondaga' may refer to:

★ Onondaga (tribe), a Native American or First Nations nationality, belonging to the Iroquois Confederacy
;Places in North America

★ Onondaga, Michigan

★ Onondaga, New York, a town in Onondaga County

★ Onondaga, Ontario

★ Onondaga County, New York

★ Onondaga Hill, New York, a hamlet in the town of Onondaga

★ Onondaga Lake

★ Onondaga Reservation, New York

★ Onondaga Township, Michigan
;Ships and organizations

★ Onondaga Community College in New York

★ Onondaga Hill Middle School in New York

★ HMCS ''Onondaga'' (S73), a submarine in the Royal Canadian Navy

★ USS ''Onondaga'', three ships of the US Navy
;Geology

★ Onondaga (geological formation), a layer of dense limestone that outcrops in New York and Ontario, Canada

★ Onandaga Cave State Park in Leasburg, Missouri is named after the geological formation